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(2n+3)=75
We move all terms to the left:
(2n+3)-(75)=0
We get rid of parentheses
2n+3-75=0
We add all the numbers together, and all the variables
2n-72=0
We move all terms containing n to the left, all other terms to the right
2n=72
n=72/2
n=36
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